Bushfires

Question 1

The fire triangle has three elements

Answer 1

Oxygen, heat, fuel

Question 2

The greater the fuel load the _____ the fire is

Answer 2

Hotter

Question 3

What accounts for over half of bushfires?

Answer 3

Lightning

Question 4

Do Flames at the fire front ignite anything flammable?

Answer 4

Yes

Question 5

What is the most dangerous type of fire front?

Answer 5

Running crown fire

Question 6

How do spot fires start?

Answer 6

When hot embers or debris are picked up by the wind

Question 7

How far can embers fly in the wind?

Answer 7

Up to 30 Kms

Question 8

How fast do grass fires pass?

Answer 8

5-10 seconds

Question 9

How long do grass fires smoulder for?

Answer 9

Only Minutes after fire has passed

Question 10

How intense are grass fires?

Answer 10

Low to Moderate

Question 11

Do bushfires move faster than grass fires?

Answer 11

No

Question 12

What are hotter bushfires or grassfires?

Answer 12

Bushfires

Question 13

How do Australian eucalypts survive in times of drought?

Answer 13

By reducing water loss by shedding their leaves

Question 14

Why do eucalypts contain aromatic oils and waxes?

Answer 14

To discourage insects from eating them

Question 15

The low water content along with the oils characteristic of eucalypts in drought means?

Answer 15

They burn explosively in bushfires

Question 16

When a fire passes through three crowns, they appear to explode when?

Answer 16

The oil rich vapour ignites in a fire ball

Question 17

Bushfire conditions are dangerous when humidity is below?

Answer 17

25%

Question 18

Fires seem to spread more quickly up?

Answer 18

Hillsides and slopes

Question 19

Why do fires spread up Hillsides and slopes faster than flat land?

Answer 19

The fires preheat their fuel source with the risen hot air

Question 20

Temperature rises by double every?

Answer 20

10 degrees of slope

Question 21

Every 10 degrees of slope temperature _____?

Answer 21

Doubles

Question 22

In what time period do eucalypt trees grow another layer of bark?

Answer 22

Every year

Question 23

What defines a low pressure cell?

Answer 23

A group of isobars where the pressure decreases toward the middle

Question 24

What is the type of pressure when a group of isobars where the pressure decreases toward the middle?

Answer 24

Low pressure system

Question 25

What does low pressure indicate?

Answer 25

Bad weather along with wind moving clockwise

Question 26

What is the type of pressure when a group of isobars where the pressure increases toward the centre?

Answer 26

High pressure cell

Question 27

What do high pressure cells indicate?

Answer 27

Good weather

Question 28

What is an isobar?

Answer 28

Lines indicating weather pressure

Question 29

How does a cold front occur?

Answer 29

When cold air invades warm air

Question 30

What indicates a cold front?

Answer 30

Sharp symbols on the isobars

Question 31

How does a warm front occur?

Answer 31

Advancing warm air rises over colder retreating air

Question 32

What indicates a warm front?

Answer 32

Semicircles along the isobars

Question 33

What are the results of a warm front?

Answer 33

Humidity and rain

Question 34

What is an occluded front?

Answer 34

When a cold front overtakes a warm air

Question 35

What forms as a result of an occluded front?

Answer 35

Dense clouds

Question 36

What way do winds blow ahead of a cold front?

Answer 36

From the north west

Question 37

What is it called when there is a lack of moisture in the air?

Answer 37

A moisture deficit

Question 38

What is a moisture deficit?

Answer 38

When there is a lack of moisture in the air